From 223b3f0d845a6a85124c004e6fe03b4bdc4f1e17 Mon Sep 17 00:00:00 2001
From: Tassilo Horn <tsdh@gnu.org>
Date: Sun, 13 Dec 2015 19:41:58 +0100
Subject: [PATCH] Improve regex to not trigger stack overflow

* lisp/textmodes/reftex-vars.el (reftex-label-regexps): Improve regex in
order not to trigger a stack overflow in regex matcher with unbalanced
brackets (bug#22146).
---
 lisp/textmodes/reftex-vars.el | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lisp/textmodes/reftex-vars.el b/lisp/textmodes/reftex-vars.el
index 5683e62493a..fcab1367f7d 100644
--- a/lisp/textmodes/reftex-vars.el
+++ b/lisp/textmodes/reftex-vars.el
@@ -877,7 +877,7 @@ DOWNCASE    t:   Downcase words before using them."
       "\\\\label{\\(?1:[^}]*\\)}"
       ;; keyvals [..., label = {foo}, ...] forms used by ctable,
       ;; listings, minted, ...
-      "\\[[^][]*\\<label[[:space:]]*=[[:space:]]*{?\\(?1:[^],}]+\\)}?")
+      "\\[[^][]\\{0,2000\\}\\<label[[:space:]]*=[[:space:]]*{?\\(?1:[^],}]+\\)}?")
     "List of regexps matching \\label definitions.
 The default value matches usual \\label{...} definitions and
 keyval style [..., label = {...}, ...] label definitions.  It is
-- 
2.39.2